CSR1001A04-IQQA-R Datasheet, PDF (28/45 Pages) –

6 Power Control and Regulation
CSR1001 QFN contains 2 regulators:
■ _{1 switch-mode regulator, which generates the main supply rail from the battery}
■ 1 low-voltage linear regulator
Figure 6.1 shows the configuration for the power control and regulation with the CSR1001 QFN.
VDD _BAT _SMPS
SMPS_LX
Switch-mode
Regulator
VDD_REG_IN
Switch
Low-voltage
VDD_DIG
Linear Regulator
VDD_RADIO 1.35 V
VDD_ANA 1.35 V
VDD_AUX 1.35 V
Digits 0.65 /1.20 V
VDD _CORE
Figure 6.1: Voltage Regulator Configuration
6.1 Switch-mode Regulator
The switch-mode regulator generates the main rail from the battery supply, VDD_BAT_SMPS. The main rail supplies
the lower regulated voltage to a further digital linear regulator and also to the analogue sections of the CSR1001 QFN.
The switch-mode regulator generates typically 1.35V.
6.2 Low-voltage VDD_DIG Linear Regulator
The integrated low-voltage VDD_DIG linear regulator powers the CSR1001 QFN digital circuits. The input voltage
range is 0.65V to 1.35V. It can supply programmable voltages of 0.65V to 1.20V to the digital area of the
CSR1001 QFN. The maximum output current for this regulator is 30mA.
Connect a minimum 470nF low ESR capacitor, e.g. MLC, to the VDD_CORE output pin. Software controls the output
voltage.
Important Note:
This regulator is only for CSR internal use. Section 7 shows CSR's recommended circuit connection.
6.3 Reset
CSR1001 QFN is reset by:
■ _{Power-on reset}
■ Software-configured watchdog timer
Production Information
© Cambridge Silicon Radio Limited 2011-2013
Page 27 of 44
CS-216358-DSP5
www.csr.com